665888090 has 16 divisors (see below), whose sum is σ = 1369827072. Its totient is φ = 228304464.

The previous prime is 665888081. The next prime is 665888123. The reversal of 665888090 is 90888566.

665888090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4756274 + ... + 4756413.

It is an arithmetic number, because the mean of its divisors is an integer number (85614192).

Almost surely, 2^665888090 is an apocalyptic number.

665888090 is an abundant number, since it is smaller than the sum of its proper divisors (703938982).

665888090 is a wasteful number, since it uses less digits than its factorization.

665888090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9512701.

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 665888090 is about 25804.8074978288. The cubic root of 665888090 is about 873.2402575801.

The spelling of 665888090 in words is "six hundred sixty-five million, eight hundred eighty-eight thousand, ninety".